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INTANGIBLE ASSETS, NET - Amortization Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Finite Lived Intangible Assets [Line Items]
Total amortization expenses	$ 371us-gaap_AmortizationOfIntangibleAssets	$ 242us-gaap_AmortizationOfIntangibleAssets
Tradenames [Member]
Finite Lived Intangible Assets [Line Items]
Total amortization expenses	22	0
Referral relationships [Member]
Finite Lived Intangible Assets [Line Items]
Total amortization expenses	245	155
Non-competition agreements [Member]
Finite Lived Intangible Assets [Line Items]
Total amortization expenses	$ 104	$ 87